Notebook labs troubleshooting

Overview

This article collects messages you may see when creating labs, managing rosters, signing in to a hub, or using the individual pay-per-hour hub. Wording comes from CloudPe APIs and hub spawn checks; the dashboard often shows the same text in a toast or under a roster row.

Before you start

• Note the lab name, region and the exact message.
• For student issues, confirm roster Status on the lab Members table.

Steps

Lab not available or blocked at spawn

• This lab is not available for your account right now. (hub spawn) — You are not an active lab member, the lab is not active, billing blocked spawns, or your organisation balance exhausted seat billing. Faculty: check lab status and Notebook labs billing. Students: ask your instructor to confirm you are active on the roster.

Create lab errors

• region not enabled — Notebooks is off for that region or the organisation is not entitled. Pick another region or contact support.
• slug already in use — Choose a unique slug.
• unknown plan, unknown image, invalid or reserved slug — Fix the create form values; slugs must be valid DNS labels.

Roster and invitations

• Member invitation cannot be resent — Resend works only for invited or invite_failed rows. Remove the member and import again, or wait for acceptance.
• invite conflict (status pill) — The email has a pending organisation invitation. Resolve on Team or cancel one of the invites.
• invite failed — Read last_error under the member; fix the email or resend.
• CSV must be 1 MiB or smaller. — Use a smaller file.

Sign-in and access

• Cannot sign in to the hub — Roster must be active; country and IP allow-list rules apply. Students are not org members but still inherit org geo/IP policy tied to the lab.
• Dashboard shows only Notebooks — Normal for lab-only students; open that page to reach labs.

Individual hub refusals

• prepaid wallet required — Pick a prepaid organisation with balance, or top up the wallet.
• not allowed to use notebooks — Missing notebooks:use or membership in the billing org.
• one session at a time — Stop the other running individual server.
• billing blocked — Overdue invoices or wallet policy blocked usage.
• Individual hub card hidden on Notebooks — Postpaid org, zero balance, ineligible region, or missing permission.

Sessions and admin actions

• Lab is not ready — Lab still provisioning or not active; wait and retry.
• cannot stop another user's session — Only stop your own server unless you manage the lab and use the lab Stop control on Sessions.
• session already ended — Refresh the sessions list.

Open in CloudPe

• Repository rejected — Only https URLs on allowed public hosts (GitHub, GitLab, Hugging Face). Fix the link or branch/path parameters.

If none of the above applies, contact support with organisation id, lab slug, screenshot of the message, and time (UTC).

• Notebook labs overview
• Create a notebook lab
• Manage a lab roster
• Student guide to notebook labs
• Individual notebook hub
• Notebook labs billing